Yes, that is a voice. But standard software is not about voices, that ad material is talking about tracks (mono or stereo bcs greater-than-stereo are not available). Voices are only used/calculated in HD/Ultimate. Maybe if all users could do their math it would have been simpler for Avid to allow 256 voices for standard software but as most are only counting tracks limiting to 128 seems sensible.

Well that's clear as mud. :)

Never having been a Vanilla user, I was just going by what they say on the website, which apparently is incorrect.